/usr/lib/python2.7/dist-packages/enable/controls.py is in python-enable 4.1.0-1ubuntu3.
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#
# Define standard Enable 'control' components, like text/image labels,
# push buttons, radio buttons, check boxes, and so on.
#
# Written by: David C. Morrill
#
# Date: 10/10/2003
#
# (c) Copyright 2003 by Enthought, Inc.
#
# Classes defined: Label
# RadioButton
# CheckBox
#
#-------------------------------------------------------------------------------
from __future__ import with_statement
# Major library imports
import os.path
# Enthought library imports
from enable.colors import ColorTrait
from traits.api import Bool, Delegate, HasTraits, Str, Trait, \
TraitPrefixList
from traitsui.api import View, Group
# Local relative imports
from component import Component
from base import LEFT, RIGHT, TOP, BOTTOM, HCENTER, VCENTER, EMBOSSED, ENGRAVED, \
transparent_color, xy_in_bounds, add_rectangles
from enable_traits import spacing_trait, padding_trait, margin_trait,\
border_size_trait, image_trait
from enable_traits import position_trait, font_trait, engraving_trait
from radio_group import RadioStyle, RadioGroup
#-------------------------------------------------------------------------------
# Constants:
#-------------------------------------------------------------------------------
empty_text_info = ( 0, 0, 0, 0 )
LEFT_OR_RIGHT = LEFT | RIGHT
TOP_OR_BOTTOM = TOP | BOTTOM
orientation_trait = Trait( 'text', TraitPrefixList( [ 'text', 'component' ] ) )
class LabelTraits ( HasTraits ):
text = Str
font = font_trait
text_position = position_trait("left")
color = ColorTrait("black")
shadow_color = ColorTrait("white")
style = engraving_trait
image = image_trait
image_position = position_trait("left")
image_orientation = orientation_trait
spacing_height = spacing_trait
spacing_width = spacing_trait
padding_left = padding_trait
padding_right = padding_trait
padding_top = padding_trait
padding_bottom = padding_trait
margin_left = margin_trait
margin_right = margin_trait
margin_top = margin_trait
margin_bottom = margin_trait
border_size = border_size_trait
border_color = ColorTrait("black")
bg_color = ColorTrait("clear")
enabled = Bool(True)
selected = Bool(False)
#---------------------------------------------------------------------------
# Trait view definitions:
#---------------------------------------------------------------------------
traits_view = View(
Group( 'enabled', 'selected',
id = 'component' ),
Group( 'text', ' ',
'font', ' ',
'color', ' ',
'shadow_color', ' ',
'style',
id = 'text',
style = 'custom' ),
Group( 'bg_color{Background Color}', '_',
'border_color', '_',
'border_size',
id = 'border',
style = 'custom' ),
Group( 'text_position', '_',
'image_position', '_',
'image_orientation', ' ',
'image',
id = 'position',
style = 'custom' ),
Group( 'spacing_height', 'spacing_width', '_',
'padding_left', 'padding_right',
'padding_top', 'padding_bottom', '_',
'margin_left', 'margin_right',
'margin_top', 'margin_bottom',
id = 'margin' )
)
default_label_traits = LabelTraits()
#-------------------------------------------------------------------------------
# 'Label' class:
#-------------------------------------------------------------------------------
LabelTraitDelegate = Delegate( 'delegate', redraw = True )
LayoutLabelTraitDelegate = LabelTraitDelegate( layout = True )
LabelContentDelegate = LayoutLabelTraitDelegate( content = True )
class Label ( Component ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
delegate = Trait( default_label_traits )
text = LabelContentDelegate
font = LabelContentDelegate
text_position = LayoutLabelTraitDelegate
color = LabelTraitDelegate
shadow_color = LabelTraitDelegate
style = LabelTraitDelegate
image = LayoutLabelTraitDelegate
image_position = LayoutLabelTraitDelegate
image_orientation = LayoutLabelTraitDelegate
spacing_height = LayoutLabelTraitDelegate
spacing_width = LayoutLabelTraitDelegate
padding_left = LayoutLabelTraitDelegate
padding_right = LayoutLabelTraitDelegate
padding_top = LayoutLabelTraitDelegate
padding_bottom = LayoutLabelTraitDelegate
margin_left = LayoutLabelTraitDelegate
margin_right = LayoutLabelTraitDelegate
margin_top = LayoutLabelTraitDelegate
margin_bottom = LayoutLabelTraitDelegate
border_size = LayoutLabelTraitDelegate
border_color = LabelTraitDelegate
bg_color = LabelTraitDelegate
enabled = LabelTraitDelegate
selected = LabelTraitDelegate
#---------------------------------------------------------------------------
# Trait view definitions:
#---------------------------------------------------------------------------
traits_view = View(
Group( '<component>', 'enabled', 'selected',
id = 'component' ),
Group( '<links>', 'delegate',
id = 'links' ),
Group( 'text', ' ',
'font', ' ',
'color', ' ',
'shadow_color', ' ',
'style',
id = 'text',
style = 'custom' ),
Group( 'bg_color{Background Color}', '_',
'border_color', '_',
'border_size',
id = 'border',
style = 'custom' ),
Group( 'text_position', '_',
'image_position', '_',
'image_orientation', ' ',
'image',
id = 'position',
style = 'custom' ),
Group( 'spacing_height', 'spacing_width', '_',
'padding_left', 'padding_right',
'padding_top', 'padding_bottom', '_',
'margin_left', 'margin_right',
'margin_top', 'margin_bottom',
id = 'margin' )
)
colorchip_map = {
'fg_color': 'color',
'bg_color': 'bg_color',
'shadow_color': 'shadow_color',
'alt_color': 'border_color'
}
#---------------------------------------------------------------------------
# Initialize the object:
#---------------------------------------------------------------------------
def __init__ ( self, text = '', **traits ):
self.text = text
Component.__init__( self, **traits )
#---------------------------------------------------------------------------
# Handle any trait being modified:
#---------------------------------------------------------------------------
def _anytrait_changed ( self, name, old, new ):
trait = self.trait( name )
if trait.content:
self.update_text()
if trait.redraw:
if trait.layout:
self.layout()
self.redraw()
#---------------------------------------------------------------------------
# Return the components that contain a specified (x,y) point:
#---------------------------------------------------------------------------
def _components_at ( self, x, y ):
if self._in_margins( x, y ):
return [ self ]
return []
#---------------------------------------------------------------------------
# Return whether not a specified point is inside the component margins:
#---------------------------------------------------------------------------
def _in_margins ( self, x, y ):
ml = self.margin_left
mb = self.margin_bottom
return xy_in_bounds( x, y, add_rectangles(
self.bounds,
( ml, mb, -(self.margin_right + ml), -(self.margin_top + mb) ) ) )
#---------------------------------------------------------------------------
# Update any information related to the text content of the control:
#---------------------------------------------------------------------------
def update_text ( self ):
text = self.text
if text == '':
self._text = []
self._tdx = []
self._max_tdx = self._tdy = 0
else:
self._text = _text = text.split( '\n' )
gc = self.gc_temp()
gc.set_font( self.font )
max_tdx = 0
self._tdx = _tdx = [ 0 ] * len( _text )
for i, text in enumerate( _text ):
tdx, tdy, descent, leading = gc.get_full_text_extent( text )
tdy += descent + 5
max_tdx = max( max_tdx, tdx )
_tdx[i] = tdx
self._max_tdx = max_tdx
self._tdy = tdy
#---------------------------------------------------------------------------
# Layout and compute the minimum size of the control:
#---------------------------------------------------------------------------
def layout ( self ):
sdx = self.spacing_width
sdy = self.spacing_height
n = len( self._text )
if n == 0:
tdx = tdy = sdx = sdy = 0
else:
tdx = self._max_tdx
tdy = self._tdy * n
image = self._image
if image is not None:
idx = image.width()
idy = image.height()
else:
idx = idy = sdx = sdy = 0
image_position = self.image_position_
if image_position & LEFT_OR_RIGHT:
itdx = tdx + sdx + idx
if image_position & LEFT:
ix = 0
tx = idx + sdx
else:
tx = 0
ix = tdx + sdx
else:
itdx = max( tdx, idx )
ix = (itdx - idx) / 2.0
tx = (itdx - tdx) / 2.0
if image_position & TOP_OR_BOTTOM:
itdy = tdy + sdy + idy
if image_position & TOP:
iy = tdy + sdy
ty = 0
else:
iy = 0
ty = idy + sdy
else:
itdy = max( tdy, idy )
iy = (itdy - idy) / 2.0
ty = (itdy - tdy) / 2.0
bs = 2 * self.border_size
self.min_width = itdx + (self.margin_left + self.margin_right +
self.padding_left + self.padding_right + bs)
self.min_height = itdy + (self.margin_top + self.margin_bottom +
self.padding_top + self.padding_bottom + bs)
self._info = ( ix, iy, idx, idy, tx, ty, tdx, self._tdy, itdx, itdy )
#---------------------------------------------------------------------------
# Draw the contents of the control:
#---------------------------------------------------------------------------
def _draw ( self, gc, view_bounds, mode):
# Set up all the control variables for quick access:
ml = self.margin_left
mr = self.margin_right
mt = self.margin_top
mb = self.margin_bottom
pl = self.padding_left
pr = self.padding_right
pt = self.padding_top
pb = self.padding_bottom
bs = self.border_size
bsd = bs + bs
bsh = bs / 2.0
x, y, dx, dy = self.bounds
ix, iy, idx, idy, tx, ty, tdx, tdy, itdx, itdy = self._info
# Fill the background region (if required);
bg_color = self.bg_color_
if bg_color is not transparent_color:
with gc:
gc.set_fill_color( bg_color )
gc.begin_path()
gc.rect( x + ml + bs, y + mb + bs,
dx - ml - mr - bsd, dy - mb - mt - bsd )
gc.fill_path()
# Draw the border (if required):
if bs > 0:
border_color = self.border_color_
if border_color is not transparent_color:
with gc:
gc.set_stroke_color( border_color )
gc.set_line_width( bs )
gc.begin_path()
gc.rect( x + ml + bsh, y + mb + bsh,
dx - ml - mr - bs, dy - mb - mt - bs )
gc.stroke_path()
# Calculate the origin of the image/text box:
text_position = self.text_position_
if self.image_orientation == 'text':
# Handle the 'image relative to text' case:
if text_position & RIGHT:
itx = x + dx - mr - bs - pr - itdx
else:
itx = x + ml + bs + pl
if text_position & HCENTER:
itx += (dx - ml - mr - bsd - pl - pr - itdx) / 2.0
if text_position & TOP:
ity = y + dy - mt - bs - pt - itdy
else:
ity = y + mb + bs + pb
if text_position & VCENTER:
ity += (dy - mb - mt - bsd - pb - pt - itdy) / 2.0
else:
# Handle the 'image relative to component' case:
itx = ity = 0.0
if text_position & RIGHT:
tx = x + dx - mr - bs - pr - tdx
else:
tx = x + ml + bs + pl
if text_position & HCENTER:
tx += (dx - ml - mr - bsd - pl - pr - tdx) / 2.0
if text_position & TOP:
ty = y + dy - mt - bs - pt - tdy
else:
ty = y + mb + bs + pb
if text_position & VCENTER:
ty += (dy - mb - mt - bsd - pb - pt - tdy) / 2.0
image_position = self.image_position_
if image_position & RIGHT:
ix = x + dx - mr - bs - pr - idx
else:
ix = x + ml + bs + pl
if image_position & HCENTER:
ix += (dx - ml - mr - bsd - pl - pr - idx) / 2.0
if image_position & TOP:
iy = y + dy - mt - bs - pt - idy
else:
iy = y + mb + bs + pb
if image_position & VCENTER:
iy += (dy - mb - mt - bsd - pb - pt - idy) / 2.0
with gc:
# Draw the image (if required):
image = self._image
if image is not None:
gc.draw_image( image, ( itx + ix, ity + iy, idx, idy ) )
# Draw the text (if required):
gc.set_font( self.font )
_text = self._text
_tdx = self._tdx
tx += itx
ty += ity + tdy * len( _text )
style = self.style_
shadow_color = self.shadow_color_
text_color = self.color_
for i, text in enumerate( _text ):
ty -= tdy
_tx = tx
if text_position & RIGHT:
_tx += tdx - _tdx[i]
elif text_position & HCENTER:
_tx += (tdx - _tdx[i]) / 2.0
# Draw the 'shadow' text, if requested:
if (style != 0) and (shadow_color is not transparent_color):
if style == EMBOSSED:
gc.set_fill_color( shadow_color )
gc.set_text_position( _tx - 1.0, ty + 1.0 )
elif style == ENGRAVED:
gc.set_fill_color( shadow_color )
gc.set_text_position( _tx + 1.0, ty - 1.0 )
else:
gc.set_fill_color( shadow_color )
gc.set_text_position( _tx + 2.0, ty - 2.0 )
gc.show_text( text )
# Draw the normal text:
gc.set_fill_color( text_color )
gc.set_text_position( _tx, ty )
gc.show_text( text )
#-- Pickling Protocol ----------------------------------------------------------
def __getstate__ ( self ):
dict = self.__dict__.copy()
try:
del dict[ '_image' ]
except:
pass
return dict
def __setstate__ ( self, state ):
self.__dict__.update( state )
self.image = self.image
#-------------------------------------------------------------------------------
# 'CheckBox' class:
#-------------------------------------------------------------------------------
class CheckBox ( Label ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
image_base = Str( '=checkbox' )
#---------------------------------------------------------------------------
# Trait editor definition:
#---------------------------------------------------------------------------
position = Group( '<position>', 'image_base' )
#---------------------------------------------------------------------------
# Initialize the object:
#---------------------------------------------------------------------------
def __init__ ( self, text = '', **traits ):
Label.__init__( self, text, **traits )
self._select_image()
#---------------------------------------------------------------------------
# Select the correct image to display:
#---------------------------------------------------------------------------
def _select_image ( self, *suffixes ):
if len( suffixes ) == 0:
suffixes = [ self._suffix() ]
base, ext = os.path.splitext( self.image_base )
for suffix in suffixes:
image = '%s%s%s' % ( base, suffix, ext )
if self.image_for( image ) is not None:
self.image = image
break
#---------------------------------------------------------------------------
# Select the image suffix based on the current selection state:
#---------------------------------------------------------------------------
def _suffix ( self ):
return [ '', '_on' ][ self.selected ]
#---------------------------------------------------------------------------
# Set the selection state of the component:
#---------------------------------------------------------------------------
def _select ( self ):
self.selected = not self.selected
#---------------------------------------------------------------------------
# Handle the 'selected' status of the checkbox being changed:
#---------------------------------------------------------------------------
def _selected_changed ( self ):
base = self._suffix()
self._select_image( base + [ '', '_over'][ self._over == True ], base )
#---------------------------------------------------------------------------
# Handle mouse events:
#---------------------------------------------------------------------------
def _left_down_changed ( self, event ):
event.handled = True
if self._in_margins( event.x, event.y ):
event.window.mouse_owner = self
base = self._suffix()
self._select_image( base + '_down', base )
self._down = True
def _left_dclick_changed ( self, event ):
self._left_down_changed( event )
def _left_up_changed ( self, event ):
event.handled = True
event.window.mouse_owner = self._down = None
if self._in_margins( event.x, event.y ):
self._select()
def _mouse_move_changed ( self, event ):
event.handled = True
self._over = self._in_margins( event.x, event.y )
if self._over:
event.window.mouse_owner = self
base = self._suffix()
self._select_image(
base + [ '_over', '_down' ][ self._down is not None ], base )
else:
if self._down is None:
event.window.mouse_owner = None
self._select_image()
#-------------------------------------------------------------------------------
# 'RadioButton' class:
#-------------------------------------------------------------------------------
class Radio ( CheckBox, RadioStyle ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
image_base = Str( '=radio' )
#---------------------------------------------------------------------------
# Set the selection state of the component:
#---------------------------------------------------------------------------
def _select ( self ):
self.selected = True
#---------------------------------------------------------------------------
# Handle the container the component belongs to being changed:
#---------------------------------------------------------------------------
def _container_changed ( self, old, new ):
CheckBox._container_changed( self )
if self.radio_group is old.radio_group:
self.radio_group = None
if self.radio_group is None:
if new.radio_group is None:
new.radio_group = RadioGroup()
new.radio_group.add( self )
#---------------------------------------------------------------------------
# Handle the 'selected' status of the checkbox being changed:
#---------------------------------------------------------------------------
def _selected_changed ( self ):
CheckBox._selected_changed( self )
if self.selected:
self.radio_group.selection = self
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